Furnace grate



July 24, 1923.

T. 'o. WILTON FURNACE GRATE Filed Feb. 2,1922 2 Sheets-Sheet 1 July'24, 1923. 1,462,994

' o. WILTON FURNACE GRATE Filed Feb. 2, 1922 2 Sheets-Sheet 2 Patented July 24, 1923.

r 1,62,9il4

Fri 1 THOMAS OW STON WILTON, OF LONIDON, ENGLAND;

FURNACE GRATE.

Application filed February 2, 1922. Serial No. 533,597.

provided with conical or tapering apertures adapted'to formp assa 'es or chambers when placed side by side, and with grooves or projections on the face which, when the fire bars are so placed, form vents which permit air and steam to pass up to the surface of the grate.

The object of this invention is to provide an improved fire bar and furnace grate with means for restricting the flow of air and steam to the rear parts of the grate so as to distribute the supply of air and steam tothe furnace grate as may be required.

According to this invention, the passages through the fire bars are suitably choked by placing baffle plates provided with suitably restricted apertures at suitable points along the grate, as may be required, so as to distribute the supply of air and steam to va rious parts of the furnace grate as may be desired. The apertures in the fire bars are preferably tapered or coned so that each passage through the fire bars, instead of being cylindrical is constituted by a succession of relatively sharp-edged constrictions.

Referring to the drawings filed herewith Fig. 1 is a longitudinal section of one form of furnace grate made in accordance with this invention;

Fig. 2 is an elevation of Fig. 1;

Fig. 3 is a plan of Fig. 1;

Fig. 4 is an elevation of one form of fire bar, showing this invention applied thereto.

cam is the furnace front, to b are tubes adapted to receive the nozzles of the blowers, 000 are fire bars, d a? d are apertures in the fire bars adapted to form passages in line with the tubes 5 6 b, when the bars are placed side by side, 6 66 are grooves on the face of the fire bars to convey air and steam from the passages to the surface of the grate, fff are plates provided with holes ggg which are smaller than the apertures in the fire bars and so choke the passages.

i a is the bridge, which ay be iholl ow, through which the blast may pass to heatthe blast and cool the bridge.- t

Referringespecially to 4, the

vidual fire bars are each provided with a plurallty of apertures cl extending through the thickness of the bars, said apertures being of greater diameter at one side. of the bar than at the other, whereby each of said apertures form a substantially conical passage through the bar. The apertures are separated from each otherbypartitions, each of which is perforated at is to permit the passage therethrough of a clamping rod The grate is formed by assembling a number of these bars face to face, that is to say, the face of one bar where the opening is smaller is placed adjacent theface of the next bar in which the opening is larger, the baffle plates f being placed at intervals between two adjacent bars. The tubes 6 are then placed between the front platea of the furnace and the first grate bar, said tubes being in alignment with the apertures 03 in said bar. The headed rods'j are then inserted through openings in the front plate a and the openings 7c in the series of bars, said rods being threaded at the inner ends to receive nuts n whereby the bars and tubes 6 are secured together, coil springs m being provided on the rods to allow for expansion and contraction due to variations of temperature. It will thus be seen that the apertures in the bars form passages from one end of the grate to the other, which passages are formed by a succession of constrictions side by side, said constrictions being adapted to give a sinuous form to the stream lines in the vicinity of the periphery of the said passages, thereby enhancing the flow of the air and steam through the grooves e c, the vertical face of the constructions arresting the flow of air and steam and deviv through the grooves eee to the surface of the grate, the perforated plates 7'' restricting the flow of the air from one part of the passage to the next, so that by altering the position of the plates and the size of the holes 9, the supply of'steam and air can be permanently adjusted to suit any requirement.

Any -fire bar can be removed by, removing the nuts n on the rodsand' withdrawing the latter.

I am aware that it has been proposed to use unperforated baffle plates or blank fire bars), located was to divide the passage constituted by the apertures in the fire bars into several distinct chambers, each of which is supplied by a distinct blower or steam jet, for the purpose of distributing the air and steam supply to various parts of "the grate, and I make no claim to this use I and kind of bafiie plate.

What I claim and desire to secure by Letters Patent is 2- I -1. A furnace grate, comprising a plurality of bars secured together, each of said bars having a plurality of apertures adapted to register with the apertures of adjacent bars thereby to form a passage through the grate for conducting air and steam longitudinally thereof, and baflie plates placed at intervals between adjacent bars, said baflie plates'having restricted apertures opening to the apertures of the bars.

2. A furnace grate, comprising a plurality of bars secured together, each of said bars having a plurality of apertures adapted to register with the apertures of adjacent bars plates having restricted apertures'opening to the apertures of the bars. 7 In testimony whereof I have signed my name to this specification I THOMAS OWSTON WILTON. 

